ABSTRACT
Detection of gastrointestinal (GI) bleeding sites can be extremely challenging and is of
great importance to interventionalists since embolization frequently provides definitive
therapy. CO2 digital subtract angiography (DSA) has increased the detection rate by
50% compared to iodinated contrast for many reasons. The most important reason is
probably its low viscosity, which improves flow through very small arterial “tears.”
Unfortunately, bowel gas motion and uncooperative patients frequently compromise
DSA imaging.
